German thorsman seals thorsman models thorsman prices

thorsman seals are typical representatives of oil seals; generally, the term "oil seal" refers to skeleton oil seals. The function of an oil seal is generally to isolate components requiring lubrication within transmission parts from the external environment, preventing lubricating oil leakage. The skeleton acts like reinforcing steel in concrete components, providing reinforcement and enabling the oil seal to maintain its shape and tension. Based on structural form, they can be divided into single-lip skeleton oil seals and double-lip skeleton oil seals. The secondary lip of a double-lip skeleton oil seal serves a dust-proof function, preventing external dust, impurities, etc., from entering the machine interior. Based on skeleton type, they can be classified as internally enclosed skeleton oil seals, externally exposed skeleton oil seals, and assembled oil seals. Based on operating conditions, they can be divided into rotating skeleton oil seals and reciprocating skeleton oil seals. Used for gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, axles, and other parts.

thorsman seal construction

The skeleton oil seal structure consists of three parts: the seal body, the reinforcing skeleton, and the self-tightening helical spring. The sealing body is further divided into the bottom, waist, cutting edge, and sealing lip according to different sections. Typically, in its free state, the inner diameter of a skeleton oil seal is smaller than the shaft diameter, meaning it has a certain "interference fit." Therefore, after the oil seal is installed into the seal housing and onto the shaft, the pressure from the oil seal cutting edge and the contraction force of the self-tightening helical spring generate a certain radial clamping force on the shaft. After a period of operation, this pressure will rapidly decrease or even disappear; thus, the spring can continuously compensate for the oil seal's self-tightening force.

thorsman seal usage instructions

1) When gearbox lubricating oil volume is ≤ 7 liters, the additive amount per liter of lubricating oil is 20‐30ml; 2) 7‐15 liters, the additive amount is 15‐20ml per liter of lubricating oil; 3) > 15 liters, the additive amount is 10ml per liter of lubricating oil; 4) Oil seals not in immediate use should be stored properly to prevent contamination with oil stains, dust, or exposure to sunlight. 5) When the shaft diameter wears into a "V" shaped groove, causing the contact pressure between the new oil seal lip and the shaft to drop such that it no longer seals effectively, a displacement method can be used for compensation.

thorsman seal precautions

1) Collect a fixed quantity of oil seals. 2) From collection to assembly, oil seals must be kept clean. 3) Before assembly, inspect the oil seals; measure whether the dimensions of all parts of the skeleton oil seal match the shaft and housing dimensions. Before installing the skeleton oil seal, clearly compare the shaft diameter with the oil seal's inner diameter to ensure they match. The internal dimensions of the housing must be suitable for the oil seal's outer diameter width. Check whether the skeleton oil seal lip is damaged or deformed, and whether the spring has detached or rusted. Prevent the oil seal from being stored flat during transport, subjected to external squeezing and impact, which could destroy its roundness. 4) Perform machining inspection procedures before assembly; measure whether the dimensions of the housing and shaft parts are correct, especially the internal chamfer, which must not have a slope. The end faces of the shaft and housing must be machined smoothly, with no damage or burrs on the chamfers. Clean the assembly area; there must be no burrs, sand, iron chips, or other debris at the shaft insertion point (chamfer), as these cause irregular damage to the oil seal lip. It is recommended to use an r angle for the chamfered section. 5) Regarding operational technique, use your hand to feel whether the surface is smooth and truly round. 6) Do not tear open the packaging paper of skeleton oil seals too early before installation, to prevent debris from adhering to the seal surface and entering into operation. 7) Before machine installation, apply an appropriate amount of lithium-based grease containing molybdenum disulfide between the lips of the skeleton oil seal to prevent dry grinding of the lip during instantaneous shaft startup, which affects the lip's interference fit, and assemble as soon as possible. If the seal housing with the installed oil seal is not immediately mounted, it is recommended to cover it with a cloth to prevent foreign matter from adhering to the seal. Hands or tools applying lithium grease must be clean. 8) Skeleton oil seals must be installed flat, without tilting. It is recommended to use hydraulic equipment or sleeve tools for installation. Pressure should not be excessive, and speed must be uniform and slow. 9) Mark the machinery on which the skeleton oil seals are installed for tracking purposes, and pay close attention to the entire process.

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